UD5 Toolkit
Sudoku Generator - Online Play & Create 9x9 Puzzles
Generate a random Sudoku puzzle with a unique solution. Choose difficulty and type numbers on the board. Timer and mistake counter.
Online Games - Fun & Casual
85+ toolsCrossword Builder - Online Create & Solve Simple Puzzles
Build a small crossword by adding words and clues. Export as a printable grid or solve in browser. Perfect for classrooms.
Mental Math Trainer - Online Timed Arithmetic
Solve random arithmetic problems under a time limit. Track your score and improve mental calculation. No data collected.
Virtual Deck Shuffler & Random Card Drawer
A fully animated deck of 52 cards. Shuffle, cut, or draw a specific number of cards. Perfect for missing cards in a real deck.
Pong Game - Online Classic Two‑Player Arcade
The original arcade Pong recreated in HTML5. Play against AI or local two‑player. Score up to 11 and win. Pure retro fun.
Chess Board Viewer - Online Setup FEN & Analyze Positions
Set up a chess position using FEN notation or drag pieces. Share the position link or screenshot. No AI, just board.
Word Search Creator - Online Generate & Print Puzzle
Enter a list of words and create a custom word search grid. Choose difficulty, print or export as PDF. Great for teachers.
Random Medieval Profession - Online RPG Background
Generate a random medieval occupation with a short description. For NPCs or historical curiosity. Local list.
Dice Notation Roller - Online 2d20, 4d6 Drop Lowest RPG Tool
Enter standard dice notation (e.g., 2d8+3, 4d6k3) and see the roll result and individual dice. Must for tabletop RPG.
Gradient Match Game - Online Drag & Match Linear CSS
Recreate the target CSS linear gradient by adjusting stops and colors. A unique game for front‑end developers to master gradients.
Tetris Game - Online Classic Block Puzzle
Enjoy classic Tetris in your browser. Rotate, move, and drop tetrominoes. Clear lines and score. Fully local JavaScript.
Anagram Solver - Online Unscramble Letters to Words
Type letters and discover all possible English words. Useful for word games like Scrabble. Dictionary lookup is client‑side.
Random Color Naming Challenge - Online Eye Test
See a random color and type its name. Score based on accuracy. Fun for designers. Local.
Bass Fretboard Trainer - Online Note Recognition Game
A random note name appears; click the correct position on the bass fretboard. Beat your time and accuracy.
Impossible Quiz - Online Tricky Question Challenge
Answer a series of deliberately confusing and trick questions. Lives system and funny wrong answers. Playful, no data stored.
Fantasy Name Generator - Online Elf Dwarf & Dragon Names
Generate names for fantasy races: elves, dwarves, orcs, dragons. Ideal for D&D and fiction writing. Markove chain local.
Random Dungeon Map Generator - Online RPG Floor Plan
Generate random dungeon maps with rooms and corridors. Use for tabletop RPGs. Every layout is unique. Export as image.
Snake Game - Online Classic Arcade in Browser
Play the classic Snake game inside your browser. Arrow keys to move, eat the apple, grow longer. High score tracked locally.
World Flag Quiz - Online Guess the Country by Flag
Random world flags shown; pick the correct country name from four choices. Score and streak. Learn geography.
Rock Paper Scissors Lizard Spock - Online Big Bang Game
Play the extended 5‑gesture version against a CPU. Rules explained. Score tracking. A geek classic.
Pig Dice Game - Online Risk & Hold Turn-Based
Play the Pig dice game: roll to accumulate points, but a 1 ends your turn. First to 100 wins. Simple hot‑seat local game.
Simon Says Game - Online Memory Sequence Challenge
Repeat the growing color sequence. How far can you go? Classic memory game with sound and animations.
Random Element Combination - Online Little Alchemy Style
Combine two random elements and get a surprising result. Inspired by Little Alchemy. Infinite ideas. All local.
Random Logic Puzzle Generator - Online Grid Problems
Generate a small logic puzzle grid (like Einstein’s riddle) with clues. Solve in browser or print. Local generation.
US States & Capitals Quiz - Online Geography Game
Test your knowledge: given a state name, pick its capital. Timed, with scoreboard. Learn all 50. No login.
Capital Cities Quiz - Online World Geography Trivia
Test your knowledge of world capitals. Multiple choice, timed rounds. Improve your geography skills. No data collection.
Character Backstory Generator - Online RPG Quick NPC
One‑click to get a full NPC backstory with motivation, secret, and appearance. Perfect for dungeon masters.
NATO Phonetic Alphabet Quiz - Online Learn Alpha Bravo
Test your knowledge of the NATO phonetic alphabet. Timed quiz with letter‑to‑code and code‑to‑letter modes.
Brick Breaker - Online Classic Breakout Arcade
Smash bricks with a ball and paddle. Multiple rows of colored bricks, power‑ups, and score tracking. All built with HTML5 Canvas.
Connect Four - Online PvP & AI Board Game
Play the classic Connect Four in your browser against a friend or CPU. Drop discs to get four in a row. Clean SVG board, local logic.
Lunar Lander Simulator - Online Retro Thrust Game
Control a lunar module and try to land softly on the moon. Manage fuel and thrust. Classic arcade physics. Canvas.
Cyberpunk Name Generator - Online Street Samurai
Create a dystopian cyberpunk character name (handle or real). Perfect for Shadowrun or Cyberpunk RED.
Random Video Game Plot Generator - Online Idea
Create a random video game premise with a setting, protagonist, and twist. For game jams and creative writing. All local.
Bingo Card Creator - Online Custom & Printable Cards
Enter a list of words or phrases and generate unique, printable bingo cards. Perfect for icebreakers and classrooms.
Whack-a-Mole - Online Reaction & Speed Game
Hit the popping moles as fast as you can before they disappear. Increasing difficulty. Great for hand‑eye coordination. Browser only.
Perfect Circle Drawing Challenge - Online Canvas Game
Try to draw a perfect circle freehand. Score based on roundness. Fun and addictive. No data sent.
Scattergories List Generator - Online Categories & Letter Roll
Generate random Scattergories‑style lists with a random letter and 12 categories. Great for online game night.
Local Typing Race - Online Side‑By‑Side Word Competition
Two players type the same text on the same keyboard (WASD vs Arrow zones) and race to finish first. Fun classroom game.
Dice Roll Probability Calculator - Online Sum & Graph
Select the number and type of dice, then view the exact probability for each possible sum as a bar chart. Great for board game strategy. Local computation.
Memory Sequence Game - Online Watch & Repeat Colors
Watch a color sequence and click the same pattern. Gets longer each round. Test and improve your working memory. All local.
Hangman Word Game - Online Guess the Hidden Word
Classic Hangman with random English words. Visual hangman drawing, keyboard support. Guess letters and save the stickman. Completely local.
Dice Probability Heatmap - Online Visual Stat Calculator
Visualize the probability distribution of dice rolls as a color‑coded heatmap. For any NdM combination. RPG strategist's dream.
CSS Selectors Game - Online Train with Restaurant Menu
Practice CSS selectors by targeting plates on a virtual restaurant table. 30+ levels. Perfect for beginners.
Flexbox Froggy Simulator - Online Learn CSS Flexbox Game
A replica of the famous Flexbox Froggy game: solve alignment puzzles by writing CSS. Progress saved locally. Fun frontend learning.
Random Skill Generator - Online Fantasy RPG Professions
Generate a random profession or skill set for RPG characters (blacksmith, alchemist, etc.). With relevant items.
Morse Code Alphabet Trainer - Online Random Character Drills
See a random letter/number and tap the Morse sequence. Instant feedback. Practice the full international Morse alphabet.
Flappy Bird Clone - Online Side‑Scroll Tap Game
Help the bird fly through pipes without touching them. Click or tap to flap. Track your high score in localStorage. Classic time‑waster.
Word Scramble Solver - Online Unjumble & Anagrams
Stuck in a word scramble game? Enter the scrambled letters and get a list of possible English words. Built‑in dictionary. All local.
Card Deck Probability Calculator - Online Poker & Draw
Calculate odds of drawing specific cards or poker hands from a standard deck. Learn combinations. Local math.
Dice Roll Simulator & Stats - Online Massive Roll Trials
Roll any number of dice thousands of times and see a live bar chart of the sum distribution. Great for game designers.
Simon Says Color Game - Online Memory Challenge
Watch and repeat the growing sequence of colored buttons. How long is your memory? Classic electronic game replica.
Rock Paper Scissors - Online Best of 3 & Score Tracker
Play Rock Paper Scissors against a smart random CPU with win/loss/draw tracking. Smooth CSS animations. No ads, pure fun.
Random Dungeon Name Generator - Online RPG Delve
Create a foreboding dungeon name for your next D&D adventure. With optional adjective and location. Pure fantasy fun.
Random Board Game Name Generator - Online Idea Spark
Generate a random name for a board game or card game. Combines adjectives and nouns. Ignite your game design creativity.
Country Outline Quiz - Online Identify by Shape
A silhouette of a country appears; type the name. Timed guesses. Great for geography buffs.
Virtual Pet Tamagotchi - Online Feed & Play
Keep a virtual pet alive by feeding, playing, and cleaning. Its state persists in localStorage. Come back or it gets sad.
Random Fictional Disease Name - Online RPG Plague
Create a frightening or silly disease name for your story or TTRPG. Includes symptoms and transmission. Pure imagination.
Number Memory Trainer - Online Recall Digits
A sequence of digits flashes for a few seconds. Type it back. Increase length. Improve your working memory.
Element Hangman - Online Guess the Chemical Symbol
Play Hangman where the words are element names. Learn the periodic table while having fun. High score localStorage.
Multi‑Player Trivia Buzzer - Online Family Feud Style
A simple web‑based buzzer system for trivia nights. Assign teams and see who buzzes first. Works on phones.